Sending twice before data appears

Spartan-3 USB 2.0 Modules
1

Hi everyone,
I’m using VB 6 to talk to the XEM3001-v2. Currently I’m trying to talk to a external SRAM using epxxwires in. The problem I’v encountered is that I have to send the data(8-bit) and address(19-bit) twice before I can see the data and address appear on the scope. Once data and address appear, I can read it back ok. Anyone has any suggestions how to deal with this lagging issue? Thanks in advance

-HaiLua

2

@HaiLua-- This “lagging” issue is not part of our API, so I suspect it may be part of the way you’re applying it with VB 6. I would suggest reviewing your code and possibly trying our examples (in C/C++) to confirm some assumptions.

3

— Begin quote from Opal Kelly Support;2440

@HaiLua-- This “lagging” issue is not part of our API, so I suspect it may be part of the way you’re applying it with VB 6. I would suggest reviewing your code and possibly trying our examples (in C/C++) to confirm some assumptions.

— End quote

Thanks, I’m hopping that someone had experienced this issue and would give some suggestions how to deal with this.

-HaiLua

4

@HaiLua-- Can you post a simplified test-case here so we can take a look?